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Modification of Polymer Surfaces by Dual Frequency Plasma

  • J. E. Klemberg-Sapieha
  • L. Martinu
  • O. M. Küttel
  • M. R. Wertheimer

Abstract

Several commercial polymers (polyethylene, polyimide, polytetrafluoroethylene, polyvinylchloride and polycarbonate) have been treated by low temperature glow discharge plasmas in various gases, namely N2, NH3, O2, Ar and CF4. These surface modifications were performed in “pure” microwave (MW, 2.45 GHz) or in combined microwave/radiofrequency (MW/RF, 2.45 GHz/13.56 MHz, “dual-frequency”) plasma. Plasma diagnostics using electrostatic probes has demonstrated intense surface bombardment by energetic ions in the MW/RF case. Important systematic changes in the surface composition (determined by XPS), water wettability (by contact angle goniometry), and adhesion of evaporated aluminum films were observed for different RF-induced substrate bias values, and for the different plasma gases. The modified surface-chemical structure is correlated with contact angle hysteresis of water drops; this helps to identify which surface characteristics are connected with the wettability and with adhesion properties, and how they are influenced by plasma-surface interactions. The contribution to the latter by VUV radiation from the plasma is also examined, as is “ageing” of the plasma treated surfaces.

Keywords

Contact Angle Plasma Treatment Water Contact Angle Polymer Surface Water Wettability 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • J. E. Klemberg-Sapieha
    • 1
  • L. Martinu
    • 1
  • O. M. Küttel
    • 1
  • M. R. Wertheimer
    • 1
  1. 1.“Groupe des Couches Minces” and Department of Engineering PhysicsEcole PolytechniqueMontréalCanada

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